From a57821cac6bb6e46abea118e34d0e86444ec1410 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 21 Aug 2014 20:39:53 -0500 Subject: block: support > 16 byte CDBs for SG_IO Signed-off-by: Christoph Hellwig Reviewed-by: Boaz Harrosh Signed-off-by: Jens Axboe --- block/scsi_ioctl.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) (limited to 'block/scsi_ioctl.c') diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index ba8706f6cded..1d78e6cf9d61 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -296,8 +296,6 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk, if (hdr->interface_id != 'S') return -EINVAL; - if (hdr->cmd_len > BLK_MAX_CDB) - return -EINVAL; if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) return -EIO; @@ -316,14 +314,21 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk, if (hdr->flags & SG_FLAG_Q_AT_HEAD) at_head = 1; + ret = -ENOMEM; rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL); if (!rq) - return -ENOMEM; + goto out; blk_rq_set_block_pc(rq); + if (hdr->cmd_len > BLK_MAX_CDB) { + rq->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); + if (!rq->cmd) + goto out_put_request; + } + ret = -EFAULT; if (blk_fill_sghdr_rq(q, rq, hdr, mode)) - goto out; + goto out_free_cdb; if (hdr->iovec_count) { size_t iov_data_len; @@ -333,7 +338,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk, 0, NULL, &iov); if (ret < 0) { kfree(iov); - goto out; + goto out_free_cdb; } iov_data_len = ret; @@ -356,7 +361,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk, GFP_KERNEL); if (ret) - goto out; + goto out_free_cdb; bio = rq->bio; memset(sense, 0, sizeof(sense)); @@ -375,8 +380,13 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk, hdr->duration = jiffies_to_msecs(jiffies - start_time); ret = blk_complete_sghdr_rq(rq, hdr, bio); -out: + +out_free_cdb: + if (rq->cmd != rq->__cmd) + kfree(rq->cmd); +out_put_request: blk_put_request(rq); +out: return ret; } -- cgit